Template:BiopSy Inter-ictal spiking refers to abnormal neuronal discharges between epileptic seizures. This abnormal activity can originate from one or more cranial lobes, often travels from one lobe to another,and interferes with normal activity from the affected lobe. Patients with severe, intractable forms of epilepsy can suffer from unremmiting abnormal brain activity due to inter-ictal spiking.

This phenomenon has been confirmed through intra-cranial EEG telemetry in which electrode grids are positioned sub-durally and augmented by intra-cranial depth electrodes. The EEG tracings from these are correlated with external video recordings of physical responses to epileptic seizures to help determine type of seizure and origin of onset.

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